C ON TENTS. 



VOL. XVI. 



Page 



Description of an Apparatus for the Verification of Sextants, designed and 

 constructed by Mr. T. Cooke, and recently erected at the Kew Observa- 

 tory. By Balfour Stewart, LL.D 2 



On the Observations made with a Eigid Spectroscope, by Captain Mayne 

 and Mr. Connor of H.M.S. 'Nassau/ on a Voyage to the Straits of Ma- 

 gellan. By J. P. Gassiot, F.K.S 6 



On some Elementary Principles in Animal Mechanics. By the Rev. Sa- 



Observations on the Anatomy of the Thyroid Body in Man. By George 

 W. Callender 24 



On the Physical Constitution of the Sun and Stars. By G. Johnstone 

 Stoney, M.A., F.R.S., F.R.A.S 25 



Researches on the Hydrocarbons of the Series C^Ha^+s. — Nq. III. By C. 

 Schorlemmer ' 34 



Researches into the Chemical Constitution of Narcotine and of its Pro- 

 ducts of Decomposition. — Part IT. By A. Matthiessen, F.R.S., and G. 



On the Chemical Intensity of Total Daylight at Kew and Para in 1865-67. 

 By Henry E. Roscoe, F.R.S 41 



On the Elimination of Nitrogen during Rest and Exercise on a regulated 

 Diet of Nitrogen. By E. A. Parkes, M.D., F.R.S 44 



Note on the Lunar-diurnal Variation of Magnetic Declinaton. By J. A. 

 Broun, F.R.S 59 



An Account of Observations on the great Nebula in Orion, made at Birr 

 Castle, with the 3-feet and 6-feet Telescopes, between 1848 and 1867. 

 By Lord Oxmantown 60 



On the apparent relation of the Nerves to the Muscular Structures in the 

 Aquatic Larva of Tipula crystalUna of De Geer. By Richard L. Mad- 

 dox, M.D , 61 



On the Identity of the Body in the Atmosphere which decomposes Iodide 

 of Potassium with Ozone. By Thomas Andrews, M.D., F.R.S , 63 



19 



C. Foster, B.A. 



39 



